blob: 2c6d5e118ac129e5ab9c24f09557b27e3248f3ea [file] [log] [blame]
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001/*
2 * Device probing and sysfs code.
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05003 *
4 * Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 */
20
Stefan Richterd54423c2010-02-18 01:50:31 +010021#include <linux/bug.h>
Stefan Richter41f321c2009-01-17 22:45:54 +010022#include <linux/ctype.h>
Kristian Høgsberg19a15b92006-12-19 19:58:31 -050023#include <linux/delay.h>
Stefan Richter41f321c2009-01-17 22:45:54 +010024#include <linux/device.h>
25#include <linux/errno.h>
Stefan Richter77c9a5d2009-06-05 16:26:18 +020026#include <linux/firewire.h>
27#include <linux/firewire-constants.h>
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -050028#include <linux/idr.h>
Stefan Richter3d36a0d2009-01-17 22:45:54 +010029#include <linux/jiffies.h>
Stefan Richter41f321c2009-01-17 22:45:54 +010030#include <linux/kobject.h>
31#include <linux/list.h>
Stefan Richterb3b29882009-02-15 23:12:34 +010032#include <linux/mod_devicetable.h>
Stefan Richtere8ca9702009-06-04 21:09:38 +020033#include <linux/module.h>
Stefan Richterd67cfb92008-10-05 10:37:11 +020034#include <linux/mutex.h>
Clemens Ladischbadfcb22012-08-13 09:08:41 +020035#include <linux/random.h>
Matthew Wilcox6188e102008-04-18 22:21:05 -040036#include <linux/rwsem.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090037#include <linux/slab.h>
Jay Fenlasoncf417e542008-10-03 11:19:09 -040038#include <linux/spinlock.h>
Stefan Richter41f321c2009-01-17 22:45:54 +010039#include <linux/string.h>
40#include <linux/workqueue.h>
41
Arun Sharma600634972011-07-26 16:09:06 -070042#include <linux/atomic.h>
Stefan Richtere8ca9702009-06-04 21:09:38 +020043#include <asm/byteorder.h>
Stefan Richter41f321c2009-01-17 22:45:54 +010044
Stefan Richter77c9a5d2009-06-05 16:26:18 +020045#include "core.h"
Kristian Høgsberg19a15b92006-12-19 19:58:31 -050046
Stefan Richter13b302d2009-12-26 01:44:10 +010047void fw_csr_iterator_init(struct fw_csr_iterator *ci, const u32 *p)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -050048{
49 ci->p = p + 1;
50 ci->end = ci->p + (p[0] >> 16);
51}
Kristian Høgsberg19a15b92006-12-19 19:58:31 -050052EXPORT_SYMBOL(fw_csr_iterator_init);
53
54int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value)
55{
56 *key = *ci->p >> 24;
57 *value = *ci->p & 0xffffff;
58
59 return ci->p++ < ci->end;
60}
Kristian Høgsberg19a15b92006-12-19 19:58:31 -050061EXPORT_SYMBOL(fw_csr_iterator_next);
62
Stefan Richter13b302d2009-12-26 01:44:10 +010063static const u32 *search_leaf(const u32 *directory, int search_key)
Clemens Ladisch1f8fef72009-12-24 11:59:57 +010064{
65 struct fw_csr_iterator ci;
66 int last_key = 0, key, value;
67
68 fw_csr_iterator_init(&ci, directory);
69 while (fw_csr_iterator_next(&ci, &key, &value)) {
70 if (last_key == search_key &&
71 key == (CSR_DESCRIPTOR | CSR_LEAF))
72 return ci.p - 1 + value;
Stefan Richter3c2c58c2009-12-26 01:43:21 +010073
Clemens Ladisch1f8fef72009-12-24 11:59:57 +010074 last_key = key;
75 }
Stefan Richter3c2c58c2009-12-26 01:43:21 +010076
Clemens Ladisch1f8fef72009-12-24 11:59:57 +010077 return NULL;
78}
79
Stefan Richter13b302d2009-12-26 01:44:10 +010080static int textual_leaf_to_string(const u32 *block, char *buf, size_t size)
Clemens Ladisch1f8fef72009-12-24 11:59:57 +010081{
Stefan Richter3c2c58c2009-12-26 01:43:21 +010082 unsigned int quadlets, i;
83 char c;
Clemens Ladisch1f8fef72009-12-24 11:59:57 +010084
85 if (!size || !buf)
86 return -EINVAL;
87
Stefan Richter3c2c58c2009-12-26 01:43:21 +010088 quadlets = min(block[0] >> 16, 256U);
Clemens Ladisch1f8fef72009-12-24 11:59:57 +010089 if (quadlets < 2)
90 return -ENODATA;
91
92 if (block[1] != 0 || block[2] != 0)
93 /* unknown language/character set */
94 return -ENODATA;
95
96 block += 3;
97 quadlets -= 2;
Stefan Richter3c2c58c2009-12-26 01:43:21 +010098 for (i = 0; i < quadlets * 4 && i < size - 1; i++) {
99 c = block[i / 4] >> (24 - 8 * (i % 4));
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100100 if (c == '\0')
101 break;
Stefan Richter3c2c58c2009-12-26 01:43:21 +0100102 buf[i] = c;
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100103 }
Stefan Richter3c2c58c2009-12-26 01:43:21 +0100104 buf[i] = '\0';
105
106 return i;
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100107}
108
109/**
Stefan Richter656b7af2010-07-07 13:26:18 +0200110 * fw_csr_string() - reads a string from the configuration ROM
111 * @directory: e.g. root directory or unit directory
112 * @key: the key of the preceding directory entry
113 * @buf: where to put the string
114 * @size: size of @buf, in bytes
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100115 *
Stefan Richter3c2c58c2009-12-26 01:43:21 +0100116 * The string is taken from a minimal ASCII text descriptor leaf after
117 * the immediate entry with @key. The string is zero-terminated.
118 * Returns strlen(buf) or a negative error code.
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100119 */
Stefan Richter13b302d2009-12-26 01:44:10 +0100120int fw_csr_string(const u32 *directory, int key, char *buf, size_t size)
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100121{
Stefan Richter13b302d2009-12-26 01:44:10 +0100122 const u32 *leaf = search_leaf(directory, key);
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100123 if (!leaf)
124 return -ENOENT;
Stefan Richter3c2c58c2009-12-26 01:43:21 +0100125
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100126 return textual_leaf_to_string(leaf, buf, size);
127}
128EXPORT_SYMBOL(fw_csr_string);
129
Stefan Richterfe43d6d2010-03-19 00:39:07 +0100130static void get_ids(const u32 *directory, int *id)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500131{
132 struct fw_csr_iterator ci;
Stefan Richter5ae73512010-03-19 00:38:29 +0100133 int key, value;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500134
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500135 fw_csr_iterator_init(&ci, directory);
136 while (fw_csr_iterator_next(&ci, &key, &value)) {
Stefan Richter5ae73512010-03-19 00:38:29 +0100137 switch (key) {
138 case CSR_VENDOR: id[0] = value; break;
139 case CSR_MODEL: id[1] = value; break;
140 case CSR_SPECIFIER_ID: id[2] = value; break;
141 case CSR_VERSION: id[3] = value; break;
142 }
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500143 }
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500144}
145
Stefan Richterfe43d6d2010-03-19 00:39:07 +0100146static void get_modalias_ids(struct fw_unit *unit, int *id)
147{
148 get_ids(&fw_parent_device(unit)->config_rom[5], id);
149 get_ids(unit->directory, id);
150}
151
152static bool match_ids(const struct ieee1394_device_id *id_table, int *id)
153{
154 int match = 0;
155
156 if (id[0] == id_table->vendor_id)
157 match |= IEEE1394_MATCH_VENDOR_ID;
158 if (id[1] == id_table->model_id)
159 match |= IEEE1394_MATCH_MODEL_ID;
160 if (id[2] == id_table->specifier_id)
161 match |= IEEE1394_MATCH_SPECIFIER_ID;
162 if (id[3] == id_table->version)
163 match |= IEEE1394_MATCH_VERSION;
164
165 return (match & id_table->match_flags) == id_table->match_flags;
166}
167
Stefan Richter94a87152013-06-09 18:15:00 +0200168static const struct ieee1394_device_id *unit_match(struct device *dev,
169 struct device_driver *drv)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500170{
Stefan Richterfe43d6d2010-03-19 00:39:07 +0100171 const struct ieee1394_device_id *id_table =
172 container_of(drv, struct fw_driver, driver)->id_table;
173 int id[] = {0, 0, 0, 0};
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500174
Stefan Richterfe43d6d2010-03-19 00:39:07 +0100175 get_modalias_ids(fw_unit(dev), id);
Stefan Richtere41f8d72009-02-16 00:22:05 +0100176
Stefan Richterfe43d6d2010-03-19 00:39:07 +0100177 for (; id_table->match_flags != 0; id_table++)
178 if (match_ids(id_table, id))
Stefan Richter94a87152013-06-09 18:15:00 +0200179 return id_table;
Stefan Richtere41f8d72009-02-16 00:22:05 +0100180
Stefan Richter94a87152013-06-09 18:15:00 +0200181 return NULL;
182}
183
184static bool is_fw_unit(struct device *dev);
185
186static int fw_unit_match(struct device *dev, struct device_driver *drv)
187{
188 /* We only allow binding to fw_units. */
189 return is_fw_unit(dev) && unit_match(dev, drv) != NULL;
190}
191
192static int fw_unit_probe(struct device *dev)
193{
194 struct fw_driver *driver =
195 container_of(dev->driver, struct fw_driver, driver);
196
Stefan Richterbcabcfd2013-06-09 18:15:00 +0200197 return driver->probe(fw_unit(dev), unit_match(dev, dev->driver));
Stefan Richter94a87152013-06-09 18:15:00 +0200198}
199
200static int fw_unit_remove(struct device *dev)
201{
202 struct fw_driver *driver =
203 container_of(dev->driver, struct fw_driver, driver);
204
Stefan Richterbcabcfd2013-06-09 18:15:00 +0200205 return driver->remove(fw_unit(dev)), 0;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500206}
207
208static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size)
209{
Stefan Richter5ae73512010-03-19 00:38:29 +0100210 int id[] = {0, 0, 0, 0};
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500211
Stefan Richterfe43d6d2010-03-19 00:39:07 +0100212 get_modalias_ids(unit, id);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500213
214 return snprintf(buffer, buffer_size,
215 "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
Stefan Richter5ae73512010-03-19 00:38:29 +0100216 id[0], id[1], id[2], id[3]);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500217}
218
Stefan Richter53dca512008-12-14 21:47:04 +0100219static int fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500220{
221 struct fw_unit *unit = fw_unit(dev);
222 char modalias[64];
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500223
Kristian Høgsberg2d826cc2007-05-09 19:23:14 -0400224 get_modalias(unit, modalias, sizeof(modalias));
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500225
Kay Sievers7eff2e72007-08-14 15:15:12 +0200226 if (add_uevent_var(env, "MODALIAS=%s", modalias))
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500227 return -ENOMEM;
228
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500229 return 0;
230}
231
232struct bus_type fw_bus_type = {
Kristian Høgsberg362c2c82007-02-06 14:49:37 -0500233 .name = "firewire",
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500234 .match = fw_unit_match,
Stefan Richter94a87152013-06-09 18:15:00 +0200235 .probe = fw_unit_probe,
236 .remove = fw_unit_remove,
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500237};
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500238EXPORT_SYMBOL(fw_bus_type);
239
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500240int fw_device_enable_phys_dma(struct fw_device *device)
241{
Stefan Richterb5d2a5e2008-01-25 18:57:41 +0100242 int generation = device->generation;
243
244 /* device->node_id, accessed below, must not be older than generation */
245 smp_rmb();
246
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500247 return device->card->driver->enable_phys_dma(device->card,
248 device->node_id,
Stefan Richterb5d2a5e2008-01-25 18:57:41 +0100249 generation);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500250}
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500251EXPORT_SYMBOL(fw_device_enable_phys_dma);
252
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400253struct config_rom_attribute {
254 struct device_attribute attr;
255 u32 key;
256};
257
Stefan Richter53dca512008-12-14 21:47:04 +0100258static ssize_t show_immediate(struct device *dev,
259 struct device_attribute *dattr, char *buf)
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400260{
261 struct config_rom_attribute *attr =
262 container_of(dattr, struct config_rom_attribute, attr);
263 struct fw_csr_iterator ci;
Stefan Richter13b302d2009-12-26 01:44:10 +0100264 const u32 *dir;
Stefan Richterc9755e12008-03-24 20:54:28 +0100265 int key, value, ret = -ENOENT;
266
267 down_read(&fw_device_rwsem);
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400268
269 if (is_fw_unit(dev))
270 dir = fw_unit(dev)->directory;
271 else
272 dir = fw_device(dev)->config_rom + 5;
273
274 fw_csr_iterator_init(&ci, dir);
275 while (fw_csr_iterator_next(&ci, &key, &value))
Stefan Richterc9755e12008-03-24 20:54:28 +0100276 if (attr->key == key) {
277 ret = snprintf(buf, buf ? PAGE_SIZE : 0,
278 "0x%06x\n", value);
279 break;
280 }
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400281
Stefan Richterc9755e12008-03-24 20:54:28 +0100282 up_read(&fw_device_rwsem);
283
284 return ret;
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400285}
286
287#define IMMEDIATE_ATTR(name, key) \
288 { __ATTR(name, S_IRUGO, show_immediate, NULL), key }
289
Stefan Richter53dca512008-12-14 21:47:04 +0100290static ssize_t show_text_leaf(struct device *dev,
291 struct device_attribute *dattr, char *buf)
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400292{
293 struct config_rom_attribute *attr =
294 container_of(dattr, struct config_rom_attribute, attr);
Stefan Richter13b302d2009-12-26 01:44:10 +0100295 const u32 *dir;
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100296 size_t bufsize;
297 char dummy_buf[2];
298 int ret;
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400299
Stefan Richterc9755e12008-03-24 20:54:28 +0100300 down_read(&fw_device_rwsem);
301
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400302 if (is_fw_unit(dev))
303 dir = fw_unit(dev)->directory;
304 else
305 dir = fw_device(dev)->config_rom + 5;
306
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100307 if (buf) {
308 bufsize = PAGE_SIZE - 1;
309 } else {
310 buf = dummy_buf;
311 bufsize = 1;
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400312 }
313
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100314 ret = fw_csr_string(dir, attr->key, buf, bufsize);
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400315
Clemens Ladisch1f8fef72009-12-24 11:59:57 +0100316 if (ret >= 0) {
317 /* Strip trailing whitespace and add newline. */
318 while (ret > 0 && isspace(buf[ret - 1]))
319 ret--;
320 strcpy(buf + ret, "\n");
321 ret++;
Stefan Richterc9755e12008-03-24 20:54:28 +0100322 }
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400323
Stefan Richterc9755e12008-03-24 20:54:28 +0100324 up_read(&fw_device_rwsem);
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400325
Stefan Richterc9755e12008-03-24 20:54:28 +0100326 return ret;
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400327}
328
329#define TEXT_LEAF_ATTR(name, key) \
330 { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key }
331
332static struct config_rom_attribute config_rom_attributes[] = {
333 IMMEDIATE_ATTR(vendor, CSR_VENDOR),
334 IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION),
335 IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID),
336 IMMEDIATE_ATTR(version, CSR_VERSION),
337 IMMEDIATE_ATTR(model, CSR_MODEL),
338 TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR),
339 TEXT_LEAF_ATTR(model_name, CSR_MODEL),
340 TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION),
341};
342
Stefan Richter53dca512008-12-14 21:47:04 +0100343static void init_fw_attribute_group(struct device *dev,
344 struct device_attribute *attrs,
345 struct fw_attribute_group *group)
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400346{
347 struct device_attribute *attr;
Kristian Høgsberg6f2e53d2007-03-27 19:35:13 -0400348 int i, j;
349
350 for (j = 0; attrs[j].attr.name != NULL; j++)
351 group->attrs[j] = &attrs[j].attr;
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400352
353 for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) {
354 attr = &config_rom_attributes[i].attr;
355 if (attr->show(dev, attr, NULL) < 0)
356 continue;
Kristian Høgsberg6f2e53d2007-03-27 19:35:13 -0400357 group->attrs[j++] = &attr->attr;
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400358 }
359
Stefan Richtere5333db2009-05-22 23:16:27 +0200360 group->attrs[j] = NULL;
Kristian Høgsberg6f2e53d2007-03-27 19:35:13 -0400361 group->groups[0] = &group->group;
362 group->groups[1] = NULL;
363 group->group.attrs = group->attrs;
David Brownella4dbd672009-06-24 10:06:31 -0700364 dev->groups = (const struct attribute_group **) group->groups;
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400365}
366
Stefan Richter53dca512008-12-14 21:47:04 +0100367static ssize_t modalias_show(struct device *dev,
368 struct device_attribute *attr, char *buf)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500369{
370 struct fw_unit *unit = fw_unit(dev);
371 int length;
372
373 length = get_modalias(unit, buf, PAGE_SIZE);
374 strcpy(buf + length, "\n");
375
376 return length + 1;
377}
378
Stefan Richter53dca512008-12-14 21:47:04 +0100379static ssize_t rom_index_show(struct device *dev,
380 struct device_attribute *attr, char *buf)
Kristian Høgsberg048961e2007-03-07 12:12:46 -0500381{
382 struct fw_device *device = fw_device(dev->parent);
383 struct fw_unit *unit = fw_unit(dev);
384
385 return snprintf(buf, PAGE_SIZE, "%d\n",
Stefan Richterd84702a2007-03-20 19:42:15 +0100386 (int)(unit->directory - device->config_rom));
Kristian Høgsberg048961e2007-03-07 12:12:46 -0500387}
388
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400389static struct device_attribute fw_unit_attributes[] = {
390 __ATTR_RO(modalias),
391 __ATTR_RO(rom_index),
392 __ATTR_NULL,
393};
394
Stefan Richter53dca512008-12-14 21:47:04 +0100395static ssize_t config_rom_show(struct device *dev,
396 struct device_attribute *attr, char *buf)
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400397{
398 struct fw_device *device = fw_device(dev);
Stefan Richterc9755e12008-03-24 20:54:28 +0100399 size_t length;
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400400
Stefan Richterc9755e12008-03-24 20:54:28 +0100401 down_read(&fw_device_rwsem);
402 length = device->config_rom_length * 4;
403 memcpy(buf, device->config_rom, length);
404 up_read(&fw_device_rwsem);
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400405
Stefan Richterc9755e12008-03-24 20:54:28 +0100406 return length;
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400407}
408
Stefan Richter53dca512008-12-14 21:47:04 +0100409static ssize_t guid_show(struct device *dev,
410 struct device_attribute *attr, char *buf)
Kristian Høgsbergbbd14942007-03-20 20:58:35 -0400411{
412 struct fw_device *device = fw_device(dev);
Stefan Richterc9755e12008-03-24 20:54:28 +0100413 int ret;
Kristian Høgsbergbbd14942007-03-20 20:58:35 -0400414
Stefan Richterc9755e12008-03-24 20:54:28 +0100415 down_read(&fw_device_rwsem);
416 ret = snprintf(buf, PAGE_SIZE, "0x%08x%08x\n",
417 device->config_rom[3], device->config_rom[4]);
418 up_read(&fw_device_rwsem);
419
420 return ret;
Kristian Høgsbergbbd14942007-03-20 20:58:35 -0400421}
422
Clemens Ladischbaedee12012-06-17 16:40:36 +0200423static ssize_t is_local_show(struct device *dev,
424 struct device_attribute *attr, char *buf)
425{
426 struct fw_device *device = fw_device(dev);
427
428 return sprintf(buf, "%u\n", device->is_local);
429}
430
Stefan Richter13b302d2009-12-26 01:44:10 +0100431static int units_sprintf(char *buf, const u32 *directory)
Stefan Richter0210b662009-05-23 00:03:29 +0200432{
433 struct fw_csr_iterator ci;
434 int key, value;
435 int specifier_id = 0;
436 int version = 0;
437
438 fw_csr_iterator_init(&ci, directory);
439 while (fw_csr_iterator_next(&ci, &key, &value)) {
440 switch (key) {
441 case CSR_SPECIFIER_ID:
442 specifier_id = value;
443 break;
444 case CSR_VERSION:
445 version = value;
446 break;
447 }
448 }
449
450 return sprintf(buf, "0x%06x:0x%06x ", specifier_id, version);
451}
452
453static ssize_t units_show(struct device *dev,
454 struct device_attribute *attr, char *buf)
455{
456 struct fw_device *device = fw_device(dev);
457 struct fw_csr_iterator ci;
458 int key, value, i = 0;
459
460 down_read(&fw_device_rwsem);
461 fw_csr_iterator_init(&ci, &device->config_rom[5]);
462 while (fw_csr_iterator_next(&ci, &key, &value)) {
463 if (key != (CSR_UNIT | CSR_DIRECTORY))
464 continue;
465 i += units_sprintf(&buf[i], ci.p + value - 1);
466 if (i >= PAGE_SIZE - (8 + 1 + 8 + 1))
467 break;
468 }
469 up_read(&fw_device_rwsem);
470
471 if (i)
472 buf[i - 1] = '\n';
473
474 return i;
475}
476
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400477static struct device_attribute fw_device_attributes[] = {
478 __ATTR_RO(config_rom),
Kristian Høgsbergbbd14942007-03-20 20:58:35 -0400479 __ATTR_RO(guid),
Clemens Ladischbaedee12012-06-17 16:40:36 +0200480 __ATTR_RO(is_local),
Stefan Richter0210b662009-05-23 00:03:29 +0200481 __ATTR_RO(units),
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400482 __ATTR_NULL,
Kristian Høgsberg048961e2007-03-07 12:12:46 -0500483};
484
Stefan Richter53dca512008-12-14 21:47:04 +0100485static int read_rom(struct fw_device *device,
486 int generation, int index, u32 *data)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500487{
Stefan Richteraaff1202011-08-07 15:20:18 +0200488 u64 offset = (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4;
489 int i, rcode;
Stefan Richterb5d2a5e2008-01-25 18:57:41 +0100490
491 /* device->node_id, accessed below, must not be older than generation */
492 smp_rmb();
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500493
Stefan Richteraaff1202011-08-07 15:20:18 +0200494 for (i = 10; i < 100; i += 10) {
495 rcode = fw_run_transaction(device->card,
496 TCODE_READ_QUADLET_REQUEST, device->node_id,
497 generation, device->max_speed, offset, data, 4);
498 if (rcode != RCODE_BUSY)
499 break;
500 msleep(i);
501 }
Jay Fenlason1e119fa2008-07-20 14:20:53 +0200502 be32_to_cpus(data);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500503
Jay Fenlason1e119fa2008-07-20 14:20:53 +0200504 return rcode;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500505}
506
Stefan Richterfd6e0c512010-02-19 21:00:31 +0100507#define MAX_CONFIG_ROM_SIZE 256
Stefan Richter1dadff72008-03-02 19:35:42 +0100508
Stefan Richterf8d2dc32008-01-25 17:53:49 +0100509/*
510 * Read the bus info block, perform a speed probe, and read all of the rest of
511 * the config ROM. We do all this with a cached bus generation. If the bus
Stefan Richterfd6e0c512010-02-19 21:00:31 +0100512 * generation changes under us, read_config_rom will fail and get retried.
Stefan Richterf8d2dc32008-01-25 17:53:49 +0100513 * It's better to start all over in this case because the node from which we
514 * are reading the ROM may have changed the ROM during the reset.
Clemens Ladisch94fba9f2012-04-11 17:39:19 +0200515 * Returns either a result code or a negative error code.
Stefan Richterf8d2dc32008-01-25 17:53:49 +0100516 */
Stefan Richterfd6e0c512010-02-19 21:00:31 +0100517static int read_config_rom(struct fw_device *device, int generation)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500518{
Stefan Richter26b49502012-02-18 22:03:14 +0100519 struct fw_card *card = device->card;
Stefan Richter13b302d2009-12-26 01:44:10 +0100520 const u32 *old_rom, *new_rom;
521 u32 *rom, *stack;
Stefan Richter1dadff72008-03-02 19:35:42 +0100522 u32 sp, key;
Clemens Ladisch94fba9f2012-04-11 17:39:19 +0200523 int i, end, length, ret;
Stefan Richter1dadff72008-03-02 19:35:42 +0100524
Stefan Richterfd6e0c512010-02-19 21:00:31 +0100525 rom = kmalloc(sizeof(*rom) * MAX_CONFIG_ROM_SIZE +
526 sizeof(*stack) * MAX_CONFIG_ROM_SIZE, GFP_KERNEL);
Stefan Richter1dadff72008-03-02 19:35:42 +0100527 if (rom == NULL)
528 return -ENOMEM;
529
Stefan Richterfd6e0c512010-02-19 21:00:31 +0100530 stack = &rom[MAX_CONFIG_ROM_SIZE];
531 memset(rom, 0, sizeof(*rom) * MAX_CONFIG_ROM_SIZE);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500532
Stefan Richterf1397492007-06-10 21:31:36 +0200533 device->max_speed = SCODE_100;
534
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500535 /* First read the bus info block. */
536 for (i = 0; i < 5; i++) {
Clemens Ladisch94fba9f2012-04-11 17:39:19 +0200537 ret = read_rom(device, generation, i, &rom[i]);
538 if (ret != RCODE_COMPLETE)
Stefan Richter1dadff72008-03-02 19:35:42 +0100539 goto out;
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400540 /*
Clemens Ladischd33ec3b2012-04-11 17:36:39 +0200541 * As per IEEE1212 7.2, during initialization, devices can
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500542 * reply with a 0 for the first quadlet of the config
543 * rom to indicate that they are booting (for example,
544 * if the firmware is on the disk of a external
545 * harddisk). In that case we just fail, and the
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400546 * retry mechanism will try again later.
547 */
Clemens Ladisch94fba9f2012-04-11 17:39:19 +0200548 if (i == 0 && rom[i] == 0) {
549 ret = RCODE_BUSY;
Stefan Richter1dadff72008-03-02 19:35:42 +0100550 goto out;
Clemens Ladisch94fba9f2012-04-11 17:39:19 +0200551 }
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500552 }
553
Stefan Richterf1397492007-06-10 21:31:36 +0200554 device->max_speed = device->node->max_speed;
555
556 /*
557 * Determine the speed of
558 * - devices with link speed less than PHY speed,
559 * - devices with 1394b PHY (unless only connected to 1394a PHYs),
560 * - all devices if there are 1394b repeaters.
561 * Note, we cannot use the bus info block's link_spd as starting point
562 * because some buggy firmwares set it lower than necessary and because
563 * 1394-1995 nodes do not have the field.
564 */
565 if ((rom[2] & 0x7) < device->max_speed ||
566 device->max_speed == SCODE_BETA ||
Stefan Richter26b49502012-02-18 22:03:14 +0100567 card->beta_repeaters_present) {
Stefan Richterf1397492007-06-10 21:31:36 +0200568 u32 dummy;
569
570 /* for S1600 and S3200 */
571 if (device->max_speed == SCODE_BETA)
Stefan Richter26b49502012-02-18 22:03:14 +0100572 device->max_speed = card->link_speed;
Stefan Richterf1397492007-06-10 21:31:36 +0200573
574 while (device->max_speed > SCODE_100) {
Stefan Richterf8d2dc32008-01-25 17:53:49 +0100575 if (read_rom(device, generation, 0, &dummy) ==
576 RCODE_COMPLETE)
Stefan Richterf1397492007-06-10 21:31:36 +0200577 break;
578 device->max_speed--;
579 }
580 }
581
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400582 /*
583 * Now parse the config rom. The config rom is a recursive
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500584 * directory structure so we parse it using a stack of
585 * references to the blocks that make up the structure. We
586 * push a reference to the root directory on the stack to
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400587 * start things off.
588 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500589 length = i;
590 sp = 0;
591 stack[sp++] = 0xc0000005;
592 while (sp > 0) {
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400593 /*
594 * Pop the next block reference of the stack. The
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500595 * lower 24 bits is the offset into the config rom,
596 * the upper 8 bits are the type of the reference the
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400597 * block.
598 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500599 key = stack[--sp];
600 i = key & 0xffffff;
Clemens Ladisch94fba9f2012-04-11 17:39:19 +0200601 if (WARN_ON(i >= MAX_CONFIG_ROM_SIZE)) {
602 ret = -ENXIO;
Stefan Richter1dadff72008-03-02 19:35:42 +0100603 goto out;
Clemens Ladisch94fba9f2012-04-11 17:39:19 +0200604 }
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500605
606 /* Read header quadlet for the block to get the length. */
Clemens Ladisch94fba9f2012-04-11 17:39:19 +0200607 ret = read_rom(device, generation, i, &rom[i]);
608 if (ret != RCODE_COMPLETE)
Stefan Richter1dadff72008-03-02 19:35:42 +0100609 goto out;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500610 end = i + (rom[i] >> 16) + 1;
Stefan Richterfd6e0c512010-02-19 21:00:31 +0100611 if (end > MAX_CONFIG_ROM_SIZE) {
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400612 /*
Stefan Richter2799d5c2010-02-18 01:52:45 +0100613 * This block extends outside the config ROM which is
614 * a firmware bug. Ignore this whole block, i.e.
615 * simply set a fake block length of 0.
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400616 */
Stefan Richter26b49502012-02-18 22:03:14 +0100617 fw_err(card, "skipped invalid ROM block %x at %llx\n",
618 rom[i],
619 i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM);
Stefan Richter2799d5c2010-02-18 01:52:45 +0100620 rom[i] = 0;
621 end = i;
622 }
623 i++;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500624
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400625 /*
626 * Now read in the block. If this is a directory
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500627 * block, check the entries as we read them to see if
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400628 * it references another block, and push it in that case.
629 */
Stefan Richterd54423c2010-02-18 01:50:31 +0100630 for (; i < end; i++) {
Clemens Ladisch94fba9f2012-04-11 17:39:19 +0200631 ret = read_rom(device, generation, i, &rom[i]);
632 if (ret != RCODE_COMPLETE)
Stefan Richter1dadff72008-03-02 19:35:42 +0100633 goto out;
Stefan Richterd54423c2010-02-18 01:50:31 +0100634
Stefan Richter58aaa542010-02-18 01:54:00 +0100635 if ((key >> 30) != 3 || (rom[i] >> 30) < 2)
Stefan Richterd54423c2010-02-18 01:50:31 +0100636 continue;
637 /*
638 * Offset points outside the ROM. May be a firmware
639 * bug or an Extended ROM entry (IEEE 1212-2001 clause
640 * 7.7.18). Simply overwrite this pointer here by a
641 * fake immediate entry so that later iterators over
642 * the ROM don't have to check offsets all the time.
643 */
Stefan Richterfd6e0c512010-02-19 21:00:31 +0100644 if (i + (rom[i] & 0xffffff) >= MAX_CONFIG_ROM_SIZE) {
Stefan Richter26b49502012-02-18 22:03:14 +0100645 fw_err(card,
646 "skipped unsupported ROM entry %x at %llx\n",
647 rom[i],
648 i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM);
Stefan Richterd54423c2010-02-18 01:50:31 +0100649 rom[i] = 0;
650 continue;
651 }
652 stack[sp++] = i + rom[i];
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500653 }
654 if (length < i)
655 length = i;
656 }
657
Stefan Richterc9755e12008-03-24 20:54:28 +0100658 old_rom = device->config_rom;
659 new_rom = kmemdup(rom, length * 4, GFP_KERNEL);
Clemens Ladisch94fba9f2012-04-11 17:39:19 +0200660 if (new_rom == NULL) {
661 ret = -ENOMEM;
Stefan Richter1dadff72008-03-02 19:35:42 +0100662 goto out;
Clemens Ladisch94fba9f2012-04-11 17:39:19 +0200663 }
Stefan Richterc9755e12008-03-24 20:54:28 +0100664
665 down_write(&fw_device_rwsem);
666 device->config_rom = new_rom;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500667 device->config_rom_length = length;
Stefan Richterc9755e12008-03-24 20:54:28 +0100668 up_write(&fw_device_rwsem);
669
670 kfree(old_rom);
Clemens Ladisch94fba9f2012-04-11 17:39:19 +0200671 ret = RCODE_COMPLETE;
Stefan Richter837ec782009-06-09 23:56:55 +0200672 device->max_rec = rom[2] >> 12 & 0xf;
673 device->cmc = rom[2] >> 30 & 1;
674 device->irmc = rom[2] >> 31 & 1;
Stefan Richter1dadff72008-03-02 19:35:42 +0100675 out:
676 kfree(rom);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500677
Stefan Richter1dadff72008-03-02 19:35:42 +0100678 return ret;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500679}
680
681static void fw_unit_release(struct device *dev)
682{
683 struct fw_unit *unit = fw_unit(dev);
684
Stefan Richter21076222011-08-27 18:53:03 +0200685 fw_device_put(fw_parent_device(unit));
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500686 kfree(unit);
687}
688
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400689static struct device_type fw_unit_type = {
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400690 .uevent = fw_unit_uevent,
691 .release = fw_unit_release,
692};
693
Stefan Richter099d5412009-06-06 18:37:25 +0200694static bool is_fw_unit(struct device *dev)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500695{
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400696 return dev->type == &fw_unit_type;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500697}
698
699static void create_units(struct fw_device *device)
700{
701 struct fw_csr_iterator ci;
702 struct fw_unit *unit;
703 int key, value, i;
704
705 i = 0;
706 fw_csr_iterator_init(&ci, &device->config_rom[5]);
707 while (fw_csr_iterator_next(&ci, &key, &value)) {
708 if (key != (CSR_UNIT | CSR_DIRECTORY))
709 continue;
710
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400711 /*
712 * Get the address of the unit directory and try to
713 * match the drivers id_tables against it.
714 */
Kristian Høgsberg2d826cc2007-05-09 19:23:14 -0400715 unit = kzalloc(sizeof(*unit), GFP_KERNEL);
Stefan Richtercfb0c9d2013-03-24 17:32:00 +0100716 if (unit == NULL)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500717 continue;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500718
719 unit->directory = ci.p + value - 1;
720 unit->device.bus = &fw_bus_type;
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400721 unit->device.type = &fw_unit_type;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500722 unit->device.parent = &device->device;
Kay Sieversa1f64812008-10-30 01:41:56 +0100723 dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500724
Stefan Richtere5333db2009-05-22 23:16:27 +0200725 BUILD_BUG_ON(ARRAY_SIZE(unit->attribute_group.attrs) <
726 ARRAY_SIZE(fw_unit_attributes) +
727 ARRAY_SIZE(config_rom_attributes));
Kristian Høgsberg6f2e53d2007-03-27 19:35:13 -0400728 init_fw_attribute_group(&unit->device,
729 fw_unit_attributes,
730 &unit->attribute_group);
Stefan Richtere5333db2009-05-22 23:16:27 +0200731
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400732 if (device_register(&unit->device) < 0)
733 goto skip_unit;
734
Stefan Richter21076222011-08-27 18:53:03 +0200735 fw_device_get(device);
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400736 continue;
737
Kristian Høgsberg7feb9cc2007-03-21 10:55:19 -0400738 skip_unit:
739 kfree(unit);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500740 }
741}
742
743static int shutdown_unit(struct device *device, void *data)
744{
Kristian Høgsberg21351db2007-03-20 20:58:33 -0400745 device_unregister(device);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500746
747 return 0;
748}
749
Stefan Richterc9755e12008-03-24 20:54:28 +0100750/*
751 * fw_device_rwsem acts as dual purpose mutex:
752 * - serializes accesses to fw_device_idr,
753 * - serializes accesses to fw_device.config_rom/.config_rom_length and
754 * fw_unit.directory, unless those accesses happen at safe occasions
755 */
756DECLARE_RWSEM(fw_device_rwsem);
757
Stefan Richterd6053e02008-11-24 20:40:00 +0100758DEFINE_IDR(fw_device_idr);
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -0500759int fw_cdev_major;
760
Stefan Richter96b19062008-02-02 15:01:09 +0100761struct fw_device *fw_device_get_by_devt(dev_t devt)
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -0500762{
763 struct fw_device *device;
764
Stefan Richterc9755e12008-03-24 20:54:28 +0100765 down_read(&fw_device_rwsem);
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -0500766 device = idr_find(&fw_device_idr, MINOR(devt));
Stefan Richter96b19062008-02-02 15:01:09 +0100767 if (device)
768 fw_device_get(device);
Stefan Richterc9755e12008-03-24 20:54:28 +0100769 up_read(&fw_device_rwsem);
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -0500770
771 return device;
772}
773
Stefan Richter105e53f2011-05-01 20:50:31 +0200774struct workqueue_struct *fw_workqueue;
775EXPORT_SYMBOL(fw_workqueue);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +0200776
777static void fw_schedule_device_work(struct fw_device *device,
778 unsigned long delay)
779{
Stefan Richter105e53f2011-05-01 20:50:31 +0200780 queue_delayed_work(fw_workqueue, &device->work, delay);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +0200781}
782
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400783/*
784 * These defines control the retry behavior for reading the config
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500785 * rom. It shouldn't be necessary to tweak these; if the device
786 * doesn't respond to a config rom read within 10 seconds, it's not
787 * going to respond at all. As for the initial delay, a lot of
788 * devices will be able to respond within half a second after bus
789 * reset. On the other hand, it's not really worth being more
790 * aggressive than that, since it scales pretty well; if 10 devices
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400791 * are plugged in, they're all getting read within one second.
792 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500793
Kristian Høgsbergc5dfd0a2007-03-27 01:43:43 -0400794#define MAX_RETRIES 10
795#define RETRY_DELAY (3 * HZ)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500796#define INITIAL_DELAY (HZ / 2)
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100797#define SHUTDOWN_DELAY (2 * HZ)
798
799static void fw_device_shutdown(struct work_struct *work)
800{
801 struct fw_device *device =
802 container_of(work, struct fw_device, work.work);
803 int minor = MINOR(device->device.devt);
804
Clemens Ladische71084a2011-01-22 15:05:03 +0100805 if (time_before64(get_jiffies_64(),
806 device->card->reset_jiffies + SHUTDOWN_DELAY)
Stefan Richtere747a5c2009-01-24 20:35:38 +0100807 && !list_empty(&device->card->link)) {
Stefan Richter6ea9e7b2010-10-13 13:39:46 +0200808 fw_schedule_device_work(device, SHUTDOWN_DELAY);
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100809 return;
810 }
811
812 if (atomic_cmpxchg(&device->state,
813 FW_DEVICE_GONE,
814 FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE)
815 return;
816
817 fw_device_cdev_remove(device);
818 device_for_each_child(&device->device, NULL, shutdown_unit);
819 device_unregister(&device->device);
820
821 down_write(&fw_device_rwsem);
822 idr_remove(&fw_device_idr, minor);
823 up_write(&fw_device_rwsem);
824
825 fw_device_put(device);
826}
827
Stefan Richteraed80892009-01-17 22:45:54 +0100828static void fw_device_release(struct device *dev)
829{
830 struct fw_device *device = fw_device(dev);
831 struct fw_card *card = device->card;
832 unsigned long flags;
833
834 /*
835 * Take the card lock so we don't set this to NULL while a
836 * FW_NODE_UPDATED callback is being handled or while the
837 * bus manager work looks at this node.
838 */
839 spin_lock_irqsave(&card->lock, flags);
840 device->node->data = NULL;
841 spin_unlock_irqrestore(&card->lock, flags);
842
843 fw_node_put(device->node);
844 kfree(device->config_rom);
845 kfree(device);
846 fw_card_put(card);
847}
848
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100849static struct device_type fw_device_type = {
Stefan Richteraed80892009-01-17 22:45:54 +0100850 .release = fw_device_release,
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100851};
852
Stefan Richter099d5412009-06-06 18:37:25 +0200853static bool is_fw_device(struct device *dev)
854{
855 return dev->type == &fw_device_type;
856}
857
Stefan Richteraed80892009-01-17 22:45:54 +0100858static int update_unit(struct device *dev, void *data)
859{
860 struct fw_unit *unit = fw_unit(dev);
861 struct fw_driver *driver = (struct fw_driver *)dev->driver;
862
863 if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) {
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800864 device_lock(dev);
Stefan Richteraed80892009-01-17 22:45:54 +0100865 driver->update(unit);
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800866 device_unlock(dev);
Stefan Richteraed80892009-01-17 22:45:54 +0100867 }
868
869 return 0;
870}
871
872static void fw_device_update(struct work_struct *work)
873{
874 struct fw_device *device =
875 container_of(work, struct fw_device, work.work);
876
877 fw_device_cdev_update(device);
878 device_for_each_child(&device->device, NULL, update_unit);
879}
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100880
881/*
882 * If a device was pending for deletion because its node went away but its
883 * bus info block and root directory header matches that of a newly discovered
884 * device, revive the existing fw_device.
885 * The newly allocated fw_device becomes obsolete instead.
886 */
887static int lookup_existing_device(struct device *dev, void *data)
888{
889 struct fw_device *old = fw_device(dev);
890 struct fw_device *new = data;
891 struct fw_card *card = new->card;
892 int match = 0;
893
Stefan Richter099d5412009-06-06 18:37:25 +0200894 if (!is_fw_device(dev))
895 return 0;
896
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100897 down_read(&fw_device_rwsem); /* serialize config_rom access */
898 spin_lock_irq(&card->lock); /* serialize node access */
899
900 if (memcmp(old->config_rom, new->config_rom, 6 * 4) == 0 &&
901 atomic_cmpxchg(&old->state,
902 FW_DEVICE_GONE,
903 FW_DEVICE_RUNNING) == FW_DEVICE_GONE) {
904 struct fw_node *current_node = new->node;
905 struct fw_node *obsolete_node = old->node;
906
907 new->node = obsolete_node;
908 new->node->data = new;
909 old->node = current_node;
910 old->node->data = old;
911
912 old->max_speed = new->max_speed;
913 old->node_id = current_node->node_id;
914 smp_wmb(); /* update node_id before generation */
915 old->generation = card->generation;
916 old->config_rom_retries = 0;
Stefan Richter26b49502012-02-18 22:03:14 +0100917 fw_notice(card, "rediscovered device %s\n", dev_name(dev));
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100918
Tejun Heo70044d72014-03-07 10:19:57 -0500919 old->workfn = fw_device_update;
Stefan Richter6ea9e7b2010-10-13 13:39:46 +0200920 fw_schedule_device_work(old, 0);
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100921
922 if (current_node == card->root_node)
923 fw_schedule_bm_work(card, 0);
924
925 match = 1;
926 }
927
928 spin_unlock_irq(&card->lock);
929 up_read(&fw_device_rwsem);
930
931 return match;
932}
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500933
Stefan Richter7889b602009-03-10 21:09:28 +0100934enum { BC_UNKNOWN = 0, BC_UNIMPLEMENTED, BC_IMPLEMENTED, };
935
Stefan Richter099d5412009-06-06 18:37:25 +0200936static void set_broadcast_channel(struct fw_device *device, int generation)
Stefan Richter7889b602009-03-10 21:09:28 +0100937{
938 struct fw_card *card = device->card;
939 __be32 data;
940 int rcode;
941
942 if (!card->broadcast_channel_allocated)
943 return;
944
Stefan Richter837ec782009-06-09 23:56:55 +0200945 /*
946 * The Broadcast_Channel Valid bit is required by nodes which want to
947 * transmit on this channel. Such transmissions are practically
948 * exclusive to IP over 1394 (RFC 2734). IP capable nodes are required
949 * to be IRM capable and have a max_rec of 8 or more. We use this fact
950 * to narrow down to which nodes we send Broadcast_Channel updates.
951 */
952 if (!device->irmc || device->max_rec < 8)
953 return;
954
955 /*
956 * Some 1394-1995 nodes crash if this 1394a-2000 register is written.
957 * Perform a read test first.
958 */
Stefan Richter7889b602009-03-10 21:09:28 +0100959 if (device->bc_implemented == BC_UNKNOWN) {
960 rcode = fw_run_transaction(card, TCODE_READ_QUADLET_REQUEST,
961 device->node_id, generation, device->max_speed,
962 CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL,
963 &data, 4);
964 switch (rcode) {
965 case RCODE_COMPLETE:
966 if (data & cpu_to_be32(1 << 31)) {
967 device->bc_implemented = BC_IMPLEMENTED;
968 break;
969 }
970 /* else fall through to case address error */
971 case RCODE_ADDRESS_ERROR:
972 device->bc_implemented = BC_UNIMPLEMENTED;
973 }
974 }
975
976 if (device->bc_implemented == BC_IMPLEMENTED) {
977 data = cpu_to_be32(BROADCAST_CHANNEL_INITIAL |
978 BROADCAST_CHANNEL_VALID);
979 fw_run_transaction(card, TCODE_WRITE_QUADLET_REQUEST,
980 device->node_id, generation, device->max_speed,
981 CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL,
982 &data, 4);
983 }
984}
985
Stefan Richter099d5412009-06-06 18:37:25 +0200986int fw_device_set_broadcast_channel(struct device *dev, void *gen)
987{
988 if (is_fw_device(dev))
989 set_broadcast_channel(fw_device(dev), (long)gen);
990
991 return 0;
992}
993
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500994static void fw_device_init(struct work_struct *work)
995{
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500996 struct fw_device *device =
997 container_of(work, struct fw_device, work.work);
Stefan Richter26b49502012-02-18 22:03:14 +0100998 struct fw_card *card = device->card;
Stefan Richter3d36a0d2009-01-17 22:45:54 +0100999 struct device *revived_dev;
Stefan Richtere1eff7a2009-02-03 17:55:19 +01001000 int minor, ret;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001001
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001002 /*
1003 * All failure paths here set node->data to NULL, so that we
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001004 * don't try to do device_for_each_child() on a kfree()'d
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001005 * device.
1006 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001007
Clemens Ladisch94fba9f2012-04-11 17:39:19 +02001008 ret = read_config_rom(device, device->generation);
1009 if (ret != RCODE_COMPLETE) {
Stefan Richter855c6032008-02-27 22:14:27 +01001010 if (device->config_rom_retries < MAX_RETRIES &&
1011 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001012 device->config_rom_retries++;
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001013 fw_schedule_device_work(device, RETRY_DELAY);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001014 } else {
Stefan Richter115881d2011-03-15 00:08:41 +01001015 if (device->node->link_on)
Clemens Ladisch94fba9f2012-04-11 17:39:19 +02001016 fw_notice(card, "giving up on node %x: reading config rom failed: %s\n",
1017 device->node_id,
1018 fw_rcode_string(ret));
Stefan Richter26b49502012-02-18 22:03:14 +01001019 if (device->node == card->root_node)
1020 fw_schedule_bm_work(card, 0);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001021 fw_device_release(&device->device);
1022 }
1023 return;
1024 }
1025
Stefan Richter26b49502012-02-18 22:03:14 +01001026 revived_dev = device_find_child(card->device,
Stefan Richter3d36a0d2009-01-17 22:45:54 +01001027 device, lookup_existing_device);
1028 if (revived_dev) {
1029 put_device(revived_dev);
1030 fw_device_release(&device->device);
1031
1032 return;
1033 }
1034
Stefan Richter62305822009-01-09 20:49:37 +01001035 device_initialize(&device->device);
Stefan Richter96b19062008-02-02 15:01:09 +01001036
1037 fw_device_get(device);
Stefan Richterc9755e12008-03-24 20:54:28 +01001038 down_write(&fw_device_rwsem);
Tejun Heo37b61892013-02-27 17:04:05 -08001039 minor = idr_alloc(&fw_device_idr, device, 0, 1 << MINORBITS,
1040 GFP_KERNEL);
Stefan Richterc9755e12008-03-24 20:54:28 +01001041 up_write(&fw_device_rwsem);
Stefan Richter96b19062008-02-02 15:01:09 +01001042
Tejun Heo37b61892013-02-27 17:04:05 -08001043 if (minor < 0)
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -05001044 goto error;
1045
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001046 device->device.bus = &fw_bus_type;
Kristian Høgsberg21351db2007-03-20 20:58:33 -04001047 device->device.type = &fw_device_type;
Stefan Richter26b49502012-02-18 22:03:14 +01001048 device->device.parent = card->device;
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -05001049 device->device.devt = MKDEV(fw_cdev_major, minor);
Kay Sieversa1f64812008-10-30 01:41:56 +01001050 dev_set_name(&device->device, "fw%d", minor);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001051
Stefan Richtere5333db2009-05-22 23:16:27 +02001052 BUILD_BUG_ON(ARRAY_SIZE(device->attribute_group.attrs) <
1053 ARRAY_SIZE(fw_device_attributes) +
1054 ARRAY_SIZE(config_rom_attributes));
Kristian Høgsberg6f2e53d2007-03-27 19:35:13 -04001055 init_fw_attribute_group(&device->device,
1056 fw_device_attributes,
1057 &device->attribute_group);
Stefan Richtere5333db2009-05-22 23:16:27 +02001058
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001059 if (device_add(&device->device)) {
Stefan Richter26b49502012-02-18 22:03:14 +01001060 fw_err(card, "failed to add device\n");
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -05001061 goto error_with_cdev;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001062 }
1063
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001064 create_units(device);
1065
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001066 /*
1067 * Transition the device to running state. If it got pulled
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001068 * out from under us while we did the intialization work, we
1069 * have to shut down the device again here. Normally, though,
1070 * fw_node_event will be responsible for shutting it down when
1071 * necessary. We have to use the atomic cmpxchg here to avoid
1072 * racing with the FW_NODE_DESTROYED case in
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001073 * fw_node_event().
1074 */
Stefan Richter641f8792007-01-27 10:34:55 +01001075 if (atomic_cmpxchg(&device->state,
Stefan Richter3d36a0d2009-01-17 22:45:54 +01001076 FW_DEVICE_INITIALIZING,
1077 FW_DEVICE_RUNNING) == FW_DEVICE_GONE) {
Tejun Heo70044d72014-03-07 10:19:57 -05001078 device->workfn = fw_device_shutdown;
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001079 fw_schedule_device_work(device, SHUTDOWN_DELAY);
Stefan Richterfa6e6972008-02-03 23:03:00 +01001080 } else {
Stefan Richter26b49502012-02-18 22:03:14 +01001081 fw_notice(card, "created device %s: GUID %08x%08x, S%d00\n",
1082 dev_name(&device->device),
1083 device->config_rom[3], device->config_rom[4],
1084 1 << device->max_speed);
Stefan Richterc9755e12008-03-24 20:54:28 +01001085 device->config_rom_retries = 0;
Stefan Richter7889b602009-03-10 21:09:28 +01001086
Stefan Richter099d5412009-06-06 18:37:25 +02001087 set_broadcast_channel(device, device->generation);
Clemens Ladischbadfcb22012-08-13 09:08:41 +02001088
1089 add_device_randomness(&device->config_rom[3], 8);
Stefan Richterfa6e6972008-02-03 23:03:00 +01001090 }
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001091
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001092 /*
1093 * Reschedule the IRM work if we just finished reading the
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001094 * root node config rom. If this races with a bus reset we
1095 * just end up running the IRM work a couple of extra times -
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001096 * pretty harmless.
1097 */
Stefan Richter26b49502012-02-18 22:03:14 +01001098 if (device->node == card->root_node)
1099 fw_schedule_bm_work(card, 0);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001100
1101 return;
1102
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -05001103 error_with_cdev:
Stefan Richterc9755e12008-03-24 20:54:28 +01001104 down_write(&fw_device_rwsem);
Kristian Høgsberga3aca3d2007-03-07 12:12:44 -05001105 idr_remove(&fw_device_idr, minor);
Stefan Richterc9755e12008-03-24 20:54:28 +01001106 up_write(&fw_device_rwsem);
Stefan Richter373b2ed2007-03-04 14:45:18 +01001107 error:
Stefan Richter96b19062008-02-02 15:01:09 +01001108 fw_device_put(device); /* fw_device_idr's reference */
1109
1110 put_device(&device->device); /* our reference */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001111}
1112
Stefan Richterc9755e12008-03-24 20:54:28 +01001113/* Reread and compare bus info block and header of root directory */
Clemens Ladischdb7494e2012-04-11 17:37:36 +02001114static int reread_config_rom(struct fw_device *device, int generation,
1115 bool *changed)
Stefan Richterc9755e12008-03-24 20:54:28 +01001116{
1117 u32 q;
Clemens Ladischdb7494e2012-04-11 17:37:36 +02001118 int i, rcode;
Stefan Richterc9755e12008-03-24 20:54:28 +01001119
1120 for (i = 0; i < 6; i++) {
Clemens Ladischdb7494e2012-04-11 17:37:36 +02001121 rcode = read_rom(device, generation, i, &q);
1122 if (rcode != RCODE_COMPLETE)
1123 return rcode;
Stefan Richterc9755e12008-03-24 20:54:28 +01001124
1125 if (i == 0 && q == 0)
Clemens Ladischd33ec3b2012-04-11 17:36:39 +02001126 /* inaccessible (see read_config_rom); retry later */
Clemens Ladischdb7494e2012-04-11 17:37:36 +02001127 return RCODE_BUSY;
Stefan Richterc9755e12008-03-24 20:54:28 +01001128
Clemens Ladischdb7494e2012-04-11 17:37:36 +02001129 if (q != device->config_rom[i]) {
1130 *changed = true;
1131 return RCODE_COMPLETE;
1132 }
Stefan Richterc9755e12008-03-24 20:54:28 +01001133 }
1134
Clemens Ladischdb7494e2012-04-11 17:37:36 +02001135 *changed = false;
1136 return RCODE_COMPLETE;
Stefan Richterc9755e12008-03-24 20:54:28 +01001137}
1138
1139static void fw_device_refresh(struct work_struct *work)
1140{
1141 struct fw_device *device =
1142 container_of(work, struct fw_device, work.work);
1143 struct fw_card *card = device->card;
Clemens Ladischdb7494e2012-04-11 17:37:36 +02001144 int ret, node_id = device->node_id;
1145 bool changed;
Stefan Richterc9755e12008-03-24 20:54:28 +01001146
Clemens Ladischdb7494e2012-04-11 17:37:36 +02001147 ret = reread_config_rom(device, device->generation, &changed);
Clemens Ladisch8527f8e2012-04-11 17:39:59 +02001148 if (ret != RCODE_COMPLETE)
1149 goto failed_config_rom;
Stefan Richterc9755e12008-03-24 20:54:28 +01001150
Clemens Ladischdb7494e2012-04-11 17:37:36 +02001151 if (!changed) {
Stefan Richterc9755e12008-03-24 20:54:28 +01001152 if (atomic_cmpxchg(&device->state,
Stefan Richter3d36a0d2009-01-17 22:45:54 +01001153 FW_DEVICE_INITIALIZING,
1154 FW_DEVICE_RUNNING) == FW_DEVICE_GONE)
Stefan Richterc9755e12008-03-24 20:54:28 +01001155 goto gone;
1156
1157 fw_device_update(work);
1158 device->config_rom_retries = 0;
1159 goto out;
Stefan Richterc9755e12008-03-24 20:54:28 +01001160 }
1161
1162 /*
1163 * Something changed. We keep things simple and don't investigate
1164 * further. We just destroy all previous units and create new ones.
1165 */
1166 device_for_each_child(&device->device, NULL, shutdown_unit);
1167
Clemens Ladisch94fba9f2012-04-11 17:39:19 +02001168 ret = read_config_rom(device, device->generation);
Clemens Ladisch8527f8e2012-04-11 17:39:59 +02001169 if (ret != RCODE_COMPLETE)
1170 goto failed_config_rom;
Stefan Richterc9755e12008-03-24 20:54:28 +01001171
Stefan Richter8b4f70b2010-07-07 15:36:07 +02001172 fw_device_cdev_update(device);
Stefan Richterc9755e12008-03-24 20:54:28 +01001173 create_units(device);
1174
Stefan Richter0210b662009-05-23 00:03:29 +02001175 /* Userspace may want to re-read attributes. */
1176 kobject_uevent(&device->device.kobj, KOBJ_CHANGE);
1177
Stefan Richterc9755e12008-03-24 20:54:28 +01001178 if (atomic_cmpxchg(&device->state,
Stefan Richter3d36a0d2009-01-17 22:45:54 +01001179 FW_DEVICE_INITIALIZING,
1180 FW_DEVICE_RUNNING) == FW_DEVICE_GONE)
Stefan Richterc9755e12008-03-24 20:54:28 +01001181 goto gone;
1182
Stefan Richter26b49502012-02-18 22:03:14 +01001183 fw_notice(card, "refreshed device %s\n", dev_name(&device->device));
Stefan Richterc9755e12008-03-24 20:54:28 +01001184 device->config_rom_retries = 0;
1185 goto out;
1186
Clemens Ladisch8527f8e2012-04-11 17:39:59 +02001187 failed_config_rom:
1188 if (device->config_rom_retries < MAX_RETRIES &&
1189 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
1190 device->config_rom_retries++;
1191 fw_schedule_device_work(device, RETRY_DELAY);
1192 return;
1193 }
1194
Clemens Ladisch94fba9f2012-04-11 17:39:19 +02001195 fw_notice(card, "giving up on refresh of device %s: %s\n",
1196 dev_name(&device->device), fw_rcode_string(ret));
Stefan Richterc9755e12008-03-24 20:54:28 +01001197 gone:
Stefan Richter3d36a0d2009-01-17 22:45:54 +01001198 atomic_set(&device->state, FW_DEVICE_GONE);
Tejun Heo70044d72014-03-07 10:19:57 -05001199 device->workfn = fw_device_shutdown;
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001200 fw_schedule_device_work(device, SHUTDOWN_DELAY);
Stefan Richterc9755e12008-03-24 20:54:28 +01001201 out:
1202 if (node_id == card->root_node->node_id)
Jay Fenlason0fa1986f2008-11-29 17:44:57 +01001203 fw_schedule_bm_work(card, 0);
Stefan Richterc9755e12008-03-24 20:54:28 +01001204}
1205
Tejun Heo70044d72014-03-07 10:19:57 -05001206static void fw_device_workfn(struct work_struct *work)
1207{
1208 struct fw_device *device = container_of(to_delayed_work(work),
1209 struct fw_device, work);
1210 device->workfn(work);
1211}
1212
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001213void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
1214{
1215 struct fw_device *device;
1216
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001217 switch (event) {
1218 case FW_NODE_CREATED:
Stefan Richter115881d2011-03-15 00:08:41 +01001219 /*
1220 * Attempt to scan the node, regardless whether its self ID has
1221 * the L (link active) flag set or not. Some broken devices
1222 * send L=0 but have an up-and-running link; others send L=1
1223 * without actually having a link.
1224 */
Stefan Richterc9755e12008-03-24 20:54:28 +01001225 create:
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001226 device = kzalloc(sizeof(*device), GFP_ATOMIC);
1227 if (device == NULL)
1228 break;
1229
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001230 /*
1231 * Do minimal intialization of the device here, the
Stefan Richter62305822009-01-09 20:49:37 +01001232 * rest will happen in fw_device_init().
1233 *
1234 * Attention: A lot of things, even fw_device_get(),
1235 * cannot be done before fw_device_init() finished!
1236 * You can basically just check device->state and
1237 * schedule work until then, but only while holding
1238 * card->lock.
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001239 */
Stefan Richter641f8792007-01-27 10:34:55 +01001240 atomic_set(&device->state, FW_DEVICE_INITIALIZING);
Stefan Richter459f7922008-05-24 16:50:22 +02001241 device->card = fw_card_get(card);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001242 device->node = fw_node_get(node);
1243 device->node_id = node->node_id;
1244 device->generation = card->generation;
Stefan Richter92368892009-05-13 21:42:14 +02001245 device->is_local = node == card->local_node;
Stefan Richterd67cfb92008-10-05 10:37:11 +02001246 mutex_init(&device->client_list_mutex);
Kristian Høgsberg97bd9ef2007-03-07 12:12:41 -05001247 INIT_LIST_HEAD(&device->client_list);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001248
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001249 /*
1250 * Set the node data to point back to this device so
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001251 * FW_NODE_UPDATED callbacks can update the node_id
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001252 * and generation for the device.
1253 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001254 node->data = device;
1255
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001256 /*
1257 * Many devices are slow to respond after bus resets,
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001258 * especially if they are bus powered and go through
1259 * power-up after getting plugged in. We schedule the
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001260 * first config rom scan half a second after bus reset.
1261 */
Tejun Heo70044d72014-03-07 10:19:57 -05001262 device->workfn = fw_device_init;
1263 INIT_DELAYED_WORK(&device->work, fw_device_workfn);
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001264 fw_schedule_device_work(device, INITIAL_DELAY);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001265 break;
1266
Stefan Richterc9755e12008-03-24 20:54:28 +01001267 case FW_NODE_INITIATED_RESET:
Stefan Richter115881d2011-03-15 00:08:41 +01001268 case FW_NODE_LINK_ON:
Stefan Richterc9755e12008-03-24 20:54:28 +01001269 device = node->data;
1270 if (device == NULL)
1271 goto create;
1272
1273 device->node_id = node->node_id;
1274 smp_wmb(); /* update node_id before generation */
1275 device->generation = card->generation;
1276 if (atomic_cmpxchg(&device->state,
1277 FW_DEVICE_RUNNING,
1278 FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) {
Tejun Heo70044d72014-03-07 10:19:57 -05001279 device->workfn = fw_device_refresh;
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001280 fw_schedule_device_work(device,
Stefan Richter92368892009-05-13 21:42:14 +02001281 device->is_local ? 0 : INITIAL_DELAY);
Stefan Richterc9755e12008-03-24 20:54:28 +01001282 }
1283 break;
1284
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001285 case FW_NODE_UPDATED:
Stefan Richter115881d2011-03-15 00:08:41 +01001286 device = node->data;
1287 if (device == NULL)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001288 break;
1289
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001290 device->node_id = node->node_id;
Stefan Richterb5d2a5e2008-01-25 18:57:41 +01001291 smp_wmb(); /* update node_id before generation */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001292 device->generation = card->generation;
Kristian Høgsberg5f480472007-03-07 12:12:39 -05001293 if (atomic_read(&device->state) == FW_DEVICE_RUNNING) {
Tejun Heo70044d72014-03-07 10:19:57 -05001294 device->workfn = fw_device_update;
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001295 fw_schedule_device_work(device, 0);
Kristian Høgsberg5f480472007-03-07 12:12:39 -05001296 }
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001297 break;
1298
1299 case FW_NODE_DESTROYED:
1300 case FW_NODE_LINK_OFF:
1301 if (!node->data)
1302 break;
1303
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001304 /*
1305 * Destroy the device associated with the node. There
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001306 * are two cases here: either the device is fully
1307 * initialized (FW_DEVICE_RUNNING) or we're in the
1308 * process of reading its config rom
1309 * (FW_DEVICE_INITIALIZING). If it is fully
1310 * initialized we can reuse device->work to schedule a
1311 * full fw_device_shutdown(). If not, there's work
1312 * scheduled to read it's config rom, and we just put
1313 * the device in shutdown state to have that code fail
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001314 * to create the device.
1315 */
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001316 device = node->data;
Stefan Richter641f8792007-01-27 10:34:55 +01001317 if (atomic_xchg(&device->state,
Stefan Richter3d36a0d2009-01-17 22:45:54 +01001318 FW_DEVICE_GONE) == FW_DEVICE_RUNNING) {
Tejun Heo70044d72014-03-07 10:19:57 -05001319 device->workfn = fw_device_shutdown;
Stefan Richter6ea9e7b2010-10-13 13:39:46 +02001320 fw_schedule_device_work(device,
Stefan Richtere747a5c2009-01-24 20:35:38 +01001321 list_empty(&card->link) ? 0 : SHUTDOWN_DELAY);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -05001322 }
1323 break;
1324 }
1325}